8166900: If you wrap a JTable in a JLayer, the cursor is moved to the last row of table by you press the page down key.

Reviewed-by: abhiscxk, dnguyen, prr, serb

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTableUI.java

@@ -437,7 +437,7 @@ public class BasicTableUI extends TableUI
                         return;
                     }
 
-                    Dimension delta = table.getParent().getSize();
+                    Dimension delta = SwingUtilities.getUnwrappedParent(table).getSize();
 
                     if (vertically) {
                         Rectangle r = table.getCellRect(leadRow, 0, true);

test/jdk/javax/swing/JTable/JLayerTableTest.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8166900
+ * @key headful
+ * @summary  Verifies selection of correct row on VK_PAGE_DOWN
+ * @run main JLayerTableTest
+ */
+
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+import javax.swing.JTable;
+import javax.swing.JLayer;
+import javax.swing.JScrollPane;
+import javax.swing.plaf.LayerUI;
+import javax.swing.table.DefaultTableModel;
+import javax.swing.SwingUtilities;
+
+public class JLayerTableTest {
+    static JFrame frame;
+    static JTable table;
+    static volatile Point tableLoc;
+    static volatile Rectangle cellRect;
+
+    static void createUI() {
+        frame = new JFrame("JLayer Table Test");
+        DefaultTableModel model = new DefaultTableModel() {
+            @Override public int getRowCount() {return 100;}
+            @Override public int getColumnCount() {return 3;}
+            @Override public Object getValueAt(int row, int column) {
+                return "(" + row + "," + column + ")";
+            }
+        };
+        table = new JTable(model);
+        LayerUI<JComponent> layerUI = new LayerUI<>();
+        JLayer<JComponent> layer = new JLayer<>(table, layerUI);
+        JScrollPane scrollPane = new JScrollPane(layer);
+        frame.getContentPane().add(scrollPane);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) throws Exception {
+        try {
+            SwingUtilities.invokeAndWait(() -> {
+                createUI();
+            });
+            Robot robot = new Robot();
+            robot.waitForIdle();
+            robot.delay(1000);
+            SwingUtilities.invokeAndWait(() -> {
+                tableLoc = table.getLocationOnScreen();
+                cellRect = table.getCellRect(0, 1, true);
+            });
+            robot.mouseMove(tableLoc.x + cellRect.x + cellRect.width / 2,
+                    tableLoc.y + cellRect.y + cellRect.height / 2);
+            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
+            robot.waitForIdle();
+            robot.delay(500);
+            robot.keyPress(KeyEvent.VK_PAGE_DOWN);
+            robot.keyRelease(KeyEvent.VK_PAGE_DOWN);
+            robot.waitForIdle();
+            robot.delay(500);
+            if (table.getSelectedRow() == (table.getRowCount() - 1)) {
+                System.out.println("selected row " + table.getSelectedRow());
+                System.out.println("visible row count " + table.getRowCount());
+                throw new RuntimeException(
+                                    "Cursor is not moved to correct location");
+            }
+        } finally {
+            SwingUtilities.invokeAndWait(() -> {
+                if (frame != null) {
+                    frame.dispose();
+                }
+            });
+        }
+    }
+}